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《Journal of Vibration and Shock》 2015-16
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Optimal design of acoustic power of laminated composite plate based on layer-wise FEM

WU Jin-wu;PENG Wen-hui;ZHAO Fei;School of Aircraft Engineering,Nanchang Hang Kong University;  
An optimization method to minimize the sound power of laminated composite plate based on genetic algorithm was presented. A layerwise finite element model was imposed to determine the natural frequencies and velocity distributions of laminated composite plates. Based on the theory of acoustic radiation mode,the radiated sound power was calculated. A four-layer and an eight-layer laminated plate were used as examples,the fiber orientation angles were taken as design variables and the minimization of sound power was chosen as design objective. The optimal orientation angles to achieve sound power minimization were discussed under different frequencies. The numerical simulations show that the first order sound power and the total sound power are basically identical under the same optimum orientation angle. For laminated composite plates with the same structure,the optimal amount of radiated sound power increases with the increase of vibration frequency. And for laminated composite plates,with the same thickness,the optimal amount of radiated sound power is smaller,the more the layer number of the plate.
【Fund】: 国家自然科学基金项目(51265038);; 航空科学基金资助项目(2011ZA56002)
【CateGory Index】: TB33;TB123
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